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Catalytic hydrodechlorination of dioxins over palladium nanoparticles in supercritical CO2 swollen microcellular
Ben-Zen Wu1, Hsiang-Yu Chen, Joanna S Wang
1Department of Chemistry, National Dong Hwa University, Hua-Lien 970, Taiwan, ROC.
Abstract:
In this study, palladium nanoparticles embedded in monolithic microcellular high density polyethylene supports are synthesized as heterogeneous catalysts for remediation of 1,6-dichlorodibenzo-p-dioxin and 2,8-dichlorodibenzofuran in 200 atm of supercritical carbon dioxide containing 10 atm of hydrogen gas and at 50-90°C. Stepwise removal of chlorine atoms takes place first, followed by saturation of two benzene rings with slower reaction rates. The pseudo first order rate constant of initial hydrodechlorination for 2,8-dichlorodibenzofuran is 4.3 times greater than that for 1,6-dichlorodibenzo-p-dioxin at 78°C. The catalysts are easily separated from products and can be recyclable and reusable without complicated recovery and cleaning procedures.
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